On the peculiar nature of turbulence in planetary dynamos

Henri-Claude Nataf; Nadège Gagnière

doi:10.1016/j.crhy.2008.07.009

The dynamo effect/L'effet dynamo

On the peculiar nature of turbulence in planetary dynamos

Henri-Claude Nataf ¹ ; Nadège Gagnière ¹

¹ University of Grenoble – Centre national de la recherche scientifique, LGIT, BP 53, maison des Geosciences, 38041 Grenoble cedex 9, France

Comptes Rendus. Physique, Dynamo effect: experimental progress and geo- and astro-physical challenges / Effet dynamo : avancées expérimentales et défis géo- et astrophysiques, Volume 9 (2008) no. 7, pp. 702-710.

Abstract
Résumé

Under the combined constraints of rapid rotation, sphericity, and magnetic field, motions in planetary cores get organized in a peculiar way. Classical hydrodynamic turbulence is not present, but turbulent motions can take place under the action of the buoyancy and Lorentz forces. Laboratory experiments, such as the rotating spherical magnetic Couette DTS experiment in Grenoble, help us understand what motions take place in planetary core conditions.

Sous les contraintes combinées de la rotation rapide, de la sphéricité et du champ magnétique, les écoulements dans les noyaux planétaires s'organisent d'une manière particulière. La turbulence hydrodynamique classique n'est pas présente mais des mouvements turbulents peuvent se mettre en place sous l'action des forces d'Archimède et de Lorentz. Des expériences de laboratoire comme l'expérience DTS de Couette sphérique sous champ magnétique à Grenoble, nous aident à comprendre les écoulements qui peuvent exister dans les conditions des noyaux planétaires.

Published online: 2008-08-28

DOI: 10.1016/j.crhy.2008.07.009

Keywords: Dynamo, Planetary core, DTS, Spherical Couette
Mots-clés : Dynamo, Noyau planétaire, DTS, Couette sphérique

Author's affiliations:

Henri-Claude Nataf ¹; Nadège Gagnière ¹

¹ University of Grenoble – Centre national de la recherche scientifique, LGIT, BP 53, maison des Geosciences, 38041 Grenoble cedex 9, France

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Henri-Claude Nataf; Nadège Gagnière. On the peculiar nature of turbulence in planetary dynamos. Comptes Rendus. Physique, Dynamo effect: experimental progress and geo- and astro-physical challenges / Effet dynamo : avancées expérimentales et défis géo- et astrophysiques, Volume 9 (2008) no. 7, pp. 702-710. doi : 10.1016/j.crhy.2008.07.009. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2008.07.009/

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